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Ubuntu: (Multiple Advisories) (CVE-2020-6096): GNU C Library vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2020-6096): GNU C Library vulnerabilities

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
04/01/2020
Created
05/18/2021
Added
05/14/2021
Modified
05/01/2023

Description

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

Solution(s)

  • ubuntu-upgrade-libc6

References

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